Just how loud does it get at Bristol Motor Speedway?

BRISTOL, TN - AUGUST 27: Fans react to a pass by Dale Earnhardt Jr., driver of the #8 Budweiser Chevrolet, during the NASCAR Nextel Cup Series Sharpie 500 on August 27, 2005 at the Bristol Motor Speedway in Bristol, Tennessee. (Photo by Rusty Jarrett/Getty Images)

The unique construction of Bristol Motor Speedway has made it the loudest track in NASCAR. Just 0.533 miles in length, the grandstands at Bristol rise the equivalent of 21 stories, which holds the noise inside the track.

How loud is it?

A 2005 study by the National Institute for Occupational Safety and Health, or Niosh, found the peak noise level at Bristol Motor Speedway during racing exceeded 140 decibels. Here are some sound comparisons: